Here are lines used to calculate the ventilation flow rate for the ZoneVentilation:WindandStackOpenArea object, extracted from HVACManager.f90.
Qw = Cw*Ventilation(J)%OpenArea*GetCurrentScheduleValue(Ventilation(J)%OpenAreaSchedPtr)*WindExt
Qst = Cd*Ventilation(J)%OpenArea*GetCurrentScheduleValue(Ventilation(J)%OpenAreaSchedPtr)* &
VVF = SQRT(Qw*Qw + Qst*Qst)
Hope this helps.
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